[Marilize]

I have a problem. I have been feeding my puppy (5 months) Science Plan Puppy Mini and I buy the small 1kg bags. I have always fed him this. But he doesn't want to eat it anymore and he has very loose, very smelly stools. I think I noticed some blood in there too. What do I do? I don't really have the money to have tests done. I have been feeding him some scrambled eggs to get him to eat something and everything improved rapidly. He is a big eater and is always hungry, but doesn't want to eat this food. Please help.